User Story
As a developer,
I want to have a hidden prop in routes.js
So that I can create routes respected by react-router, but not shown in Sidebar.js

Description
A hidden prop can be added in routes.js that would still be loaded into the react-router, but not rendered in the Sidenav.
This will allow devs to not have to manually create custom router logic for their nested routes.

See PR:
https://github.com/horizon-ui/horizon-ui-chakra/pull/22/files?diff=split&w=1 (whitespace removed for readability)